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Reports the cases when you rewrite a loop variable with an inner loop.
<p><b>Example:</b></p>
<pre><code>
    for i in range(5):
      for i in range(20, 25):
          print("Inner", i)
      print("Outer", i)
  </code></pre>

It also warns you if a variable declared in the <code>with</code> statement is redeclared inside the statement body:
<pre><code>
    with open("file") as f:
      f.read()
      with open("file") as f:
  </code></pre>
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